EP 1058246 A2 20001206 - Method and apparatus of controlling power supplied to laser diode
Title (en)
Method and apparatus of controlling power supplied to laser diode
Title (de)
Verfahren und Gerät zur Steuerung der einer Laserdiode zugeführten Energieversorgung
Title (fr)
Méthode et appareil de contrôle de la puissance fournie à une diode laser
Publication
Application
Priority
KR 19990018848 A 19990525
Abstract (en)
A method and apparatus for controlling the power of a laser diode (160), which can prevent fluctuation in the laser power of the laser diode (160) at a record/playback area of an optical disc (180). The apparatus for controlling the power of the laser diode includes a controller (300) for providing an automatic power control of the laser diode (APC controller), interposed between an up/down counter (208) and a laser diode driver (140), the APC controller (300) for latching the output of the up/down counter (208) in synchronism with a periodic synchronization signal, and outputting the latch result to the laser diode driver (140). Therefore, the power level of the laser diode (160) can be periodically controlled according to the sub-divided control modes, so that the laser power level remains resilient to external noise, compared to continuous control operation through the entire mode. <IMAGE>
IPC 1-7
IPC 8 full level
G11B 7/125 (2006.01); H01S 3/094 (2006.01)
CPC (source: EP KR US)
G11B 7/126 (2013.01 - EP US); G11B 7/1263 (2013.01 - EP US); H01S 3/094 (2013.01 - KR)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
US 7057990 B1 20060606; CN 1154013 C 20040616; CN 1274862 A 20001129; DE 60027816 D1 20060614; DE 60027816 T2 20061026; EP 1058246 A2 20001206; EP 1058246 A3 20010816; EP 1058246 B1 20060510; JP 2000339736 A 20001208; KR 100346701 B1 20020801; KR 20000074716 A 20001215; MY 127642 A 20061229
DOCDB simple family (application)
US 51510100 A 20000229; CN 00103650 A 20000229; DE 60027816 T 20000224; EP 00301451 A 20000224; JP 2000052002 A 20000228; KR 19990018848 A 19990525; MY PI20000756 A 20000228